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1 of all existing pavement markings and channelization in the field prior to grinding <br /> 2 operations. This work includes but is not limited to: field notes, sketches, offset <br /> 3 markings on curbs or staking if no curb exists. <br /> 4 <br /> 5 The records and offset marking/staking shall be adequate to allow the pavement <br /> 6 markings to be reproduced to a level of accuracy shown below: <br /> 7 <br /> 8 Lane widths ±0.1 feet (normal to alignment) <br /> 9 Longitudinal location of arrows and letters ±1.0 feet (parallel to alignment) <br /> 10 Longitudinal location of stop lines ±1.0 feet (parallel to alignment) <br /> 11 Transverse location of arrows and letters ±0.1 feet (normal to alignment) <br /> 12 Longitudinal location of transitions and tapers±1.0 feet (parallel to alignment) <br /> 13 Pavement marking starts and stops ±1.0 feet (parallel to alignment) <br /> 14 <br /> 15 The Contractor shall provide copies of any calculations, notes, and layout data <br /> 16 to the Engineer, or their assigned representative, prior to grinding. The <br /> 17 Contracting Agency will review the provided data, check the existing layout and <br /> 18 provide revisions as necessary for establishment of lane widths, arrow and letter <br /> 19 locations, tapers, transitions, other modifications, and pavement seams. The <br /> 20 Contracting Agency will require up to seven calendar days from the date the <br /> 21 data is received to conduct this review. No pavement grinding will be allowed <br /> 22 before this review is complete. The Contractor will make adjustments to the curb <br /> 23 marking and stakes to match the revisions prior to grinding. <br /> 24 <br /> 25 Based on these records and/or the offset staking, the Contractor shall perform <br /> 26 all field marking and preliminary spotting for all pavement marking and <br /> 27 channelization following grinding operations, for temporary only. The <br /> 28 Contracting Agency shall perform all field marking for permanent pavement <br /> 29 marking and channelization.All calculations, surveying, and measuring required <br /> 30 for setting and maintaining the necessary lines for the temporary pavement <br /> 31 marking shall be the Contractor's responsibility. <br /> 32 <br /> 33 Preliminary spotting shall be provided at a spacing of 40 foot maximum on <br /> 34 tangents and 25 foot maximum on curves and tapers. All curves, tapers, stop <br /> 35 lines, and crosswalks shall be laid out with a rope. Field layout for curves and <br /> 36 tapers shall use an 800' minimum length rope. The color of the material used <br /> 37 for preliminary spotting shall be white. Longitudinal marking shall be parallel <br /> 38 with the proposed line applied with a paint marker wand or other approved <br /> 39 method, a minimum of 6 inches in length and wide enough so that a minimum <br /> 40 of two marks can be clearly seen at night under ordinary headlight conditions. <br /> 41 Refreshing of marks prior to striping shall be the responsibility of the Contractor. <br /> 42 <br /> 43 Personnel performing the field layout and preliminary spotting shall be proficient <br /> 44 in the practice of striping layout, including layout and preliminary spotting of <br /> 45 curves and tapers using a rope and paint wand, proper annotation on the <br /> 46 pavement of starts, stops, and changes in line type for pavement markings, and <br /> 47 an understanding of WSDOT Standard Plans and City Standard Drawings for <br /> 48 pavement markings. <br /> 49 <br /> 50 Survey personnel performing the calculations, notes, and layout data shall be <br /> 51 on site to answer questions regarding the layout notes as the roadway is being <br /> 2023 PAVEMENT MAINTENANCE OVERLAY <br /> WO#1-3789 February 14,2023 78 <br />